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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414ddb015c7c9c1d7867b1b208f96b9276c65edeca688d97de19cbb2d6a12620' 
  AND token = 'EUhLG1uYwhMM3J6lrjplsNe4hAuRoLjeYl3jx92ssDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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