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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee8485cd7b55df0d46ae3df28cd62139a0cf31bc5a72685a8a034524f90b4e5' 
  AND token = 'N3EMic7JSLGfOqgcslrbUbB4JNxBIbD4I39Cu0pSynI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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