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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc9b0a7dac2393886373dc6746e05866daba35263ac0475952f1286609d06a0' 
  AND token = 'dHXMO1JIavCA5sq1DJ6b0EpVGX98qN7mfOMwN+kVjeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}