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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ed42c611e2f1950f711cf8cc7f5a0a29d5e79a7380afd26cb28e0aeb6b84b4' 
  AND token = 'qhXyWc50UiPknGiaYUVqUBvihHezVn7spW032ur00dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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