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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc6464c449672576315b8ece90b64b8b8c8d175201121fef02606a34d5ac5bf' 
  AND token = 'EQKHMfvxb8R/vESu/1fe6Lr9ZnbQHqse074G/psnZFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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