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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4f01034ba40bb5282d7b4c4d681c7c7ee80fbad07e705b608cc6adbb6f784c' 
  AND token = 'l0RPef1Lfsy8WD1pBgBBVulcAdXr4n4y2f4GlxYqTpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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