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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd475fb769f231f95434d4d99a948a78fbae6c18f4023c3caabec40d5582f0b1' 
  AND token = 'vC8czXn9oj6tQm/cOXPjuS78bRhKQHb0Li3amY1Oxm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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