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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98265cf5da4b92a63f80a49bb5497081dc29d4fb35fd2a29545108d0a52ac0ca' 
  AND token = 'MJVqMztVUy8Hs6sZSeObGSfP2NxvunFX+eAnB5goAMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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