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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd29902f407387dc6bcf80a5f974242c5efbbfe6ffa8ded9d6c355c8fc8a113d' 
  AND token = 'oSmMU91R+ko2cwin6bbzjBGyq8n1s+tY6awSKsEcKO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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