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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a9fd3a93f5d2d46ef1ee55cdef7d65dd9fda0fae1be4b4df453357b8d214d0' 
  AND token = 'gp8+/heh2A6pi+Qo+Vv2cpw8ZBMMoAqVO4pIvOK7sWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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