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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25278f3dde8302d7f622125746d9bb0b35ca1e3c141114a2c0ad3cad5c375e18' 
  AND token = 'Ss0ZTQm7C1AV9KYwUyOqJvLSV2pqxD73tMcJnhN3pYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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