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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf0cc0ec81cf399d8665b626036d7b45233e41fb1bc8e90a2b57566e06e8ee8' 
  AND token = '6ciLRiRpqRT8JTLFhemkspz/z+1SckiZgRJgUQ9QvGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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