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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00716723b0d120717e7ddcd692fa095991f8b9c9b9049e2d03d5e7fd3657cab3' 
  AND token = 'xVFQvvUOp1JVPLbj5zRXjo3kmRE/NOWJdEab/SJoGm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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