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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d713982d3d2526ef9cd58f267d9be83081a352b7b8b25527f77096735e9b11' 
  AND token = '29n+q13YHPTb6/rtAGeTrk06/0UVgfUAKi4YXEvFNOk=' 
  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"
    }
  }
}