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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71f3ffe2153b5f49172b2326556c98195f0915f417428fe4e4c5659c7df9780' 
  AND token = '+k9pNwoRFOO4SsvSKtweElnG+reJUxN7iUnOeW3egvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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