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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6278e91b96eff1dae630b4360b8aa0aac5a2fadc3e33a74c0c571d71e3a6ea' 
  AND token = 'SwDuH0QlGqMrTEVEckj3fcKpuQ9a2AzmttE6yUzeu/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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