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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec273e5c805f0f1be106b244a8356c2450a1ba3035577ccbbf5b83dc398caf0' 
  AND token = 's07vShRl5+ibHP/CLCJUxP8nhELa1Ja0DHvlWP4KYXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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