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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1278aa032bbc60e9c99171895946a1c9dfc1fdbe806f474c73d84fe05c2ea5a1' 
  AND token = 'cdpquWCNmN4/+8cpq7GonEWQfJx9mOFBR02J17PUWDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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