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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93f9731e789d5f25a8aeda9ff40d810d0c9468162c807a3a28b6145632643ba' 
  AND token = '9RPiiLb2HOJRDW+rQpI8PR+NiNbj5CWoKV0sNzdz4Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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