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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4f312f0b49b9fd048c7f43574dc0b6b6549d0d00e3b23e609df5a9e46e07e5' 
  AND token = 'KSGQ1GfQq9nFcGgPE32+2kZO0D959iSGQeaxXT6ynqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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