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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dbf1acb62d654fd10ba00e698c74f0271a71c6dbaeeca88368b1b5e4ce90f22' 
  AND token = '76VgG6XISPAGYZXp6WrnwGMRDf99vo58xLsgIAZP59A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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