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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5caf1005b13ffc3690479bc07df0c0bb397a617f4d7f8d66ccb2f3a7fabadfda' 
  AND token = 'yTvnzEqHYXBHCAiItwx+JUBxapNVjBt3T8Zr1ohb9AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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