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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676532fdf8bc560a2d2c2f81bd2c0a2d47d3bbda0d9538bc1b476a0755943b1f' 
  AND token = 'wdz7H2wnt16S3tqTiS2X/j29pq0x5WE5A3k5aMmm7qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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