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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a163274c7713d06fe6c4f366d4079a86a5ce3d52280ed1ca5d9140c863207d4' 
  AND token = 'PQ4B/3oSo0PuLhFCnP7z19PP1UvZgWU7YI93OPLRsQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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