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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494d05584e4c141bc974a07e6eeec6b2c6b0c0be258c6100425fc3e5068ad9b3' 
  AND token = 'PER/sxHr+/1awmgIIyR3oG2XzwDaai8dX3pp2xzzWcA=' 
  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"
    }
  }
}