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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0109b6b514421e9907c4bc2645b57dc9def05c2ec1d698faf48eaf78acd4e454' 
  AND token = 'zv2YFSSEV8p67R+o+JW0uFR+6TKn7fSQMHIJ28rs6jg=' 
  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"
    }
  }
}