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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ebb67f5708daa01d80027687cb4bf47ca0085817423b293a548ea0f76e34aa' 
  AND token = '5yuGV1aPVGScXXn9UHiFZ5w+ztvZgtK0l0PMD6HqAwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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