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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c2c82e593d2eaef6610c475ebb1a5e63890df603ea26eaadd868629868a5a7' 
  AND token = 'Xu5sK4M7Nep8nvbSkKS9b2dUBneDjaDIpkqf/BJEgy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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