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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9b8f68533f4f6d3ae5e80199f9e783683ed1823fc4f3995b3a17c2460c98b6' 
  AND token = 'ngmhzrLDa/XTyVRrEnz1OMj7a+Uen8nVMfKe+6UK1JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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