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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3754e2f6b82653f66595290568245dc3938d8ee77c2e67c160abd86fd61fe06' 
  AND token = 'iv7+if+9DgIJ1atnqT/6sJeY87n5prl8TWD88SUyeJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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