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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fad980ab5bb8c6cd8311424523ca87f96e65027b22014c7fee4e0a23e473363' 
  AND token = 'fu/pfJe/jLFfnuwZa+y3f1IDlL2gJ/lKwL8YC2w3KoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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