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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f388f0067d939a190fd00698622181bec7c8c7e58cbd208fe5b99e95d6a4a055' 
  AND token = '85CLqVGwrdCSid4mlcnmDkpGawjObS3Ra566bRoTXrI=' 
  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"
    }
  }
}