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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dbf2f0cb5e6ed1e5216ce81cc4c4acfa95ded7251ce3b9c7268d8a0c4b755f' 
  AND token = 'w283Sjj1Z7X19qbZOiGPZjjK7iULwwSViAsiOQViT4U=' 
  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"
    }
  }
}