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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e4d784b920d0a09e1bda46b63ddfd1db2e8e1cb438529f65867a2ec3038ea8' 
  AND token = '+HEqyfy+QAEf5faqjs2pvpauKJT6inYCWox/jj9fW8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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