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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cfcf4439c5e9a59a34869444e62328e33ade751bc07a592ef923fc1d2c5ee47' 
  AND token = 'uy5IVg6SE8d4gs4pYDt+XI/TO16D8uhrwiDAq89h8rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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