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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07db5be1dbc6a07b2668ef63526fbd9248486a0354fd2c6492f8bcc23cd10d28' 
  AND token = '9LVHwhjd/sLaCEMcMIKCgRQ7x8mNOSy+yM/yIFs2o6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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