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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e96314ec5bf9d0cf15ef9b49a7b1029d69314236c6173ad8dccc39f99042c4' 
  AND token = '7bJ65LRh/TSK2lKw1XKIRaWzz1ld8unBfuVQETK9oAo=' 
  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"
    }
  }
}