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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8904873fbfe4a177f22ac3a573ab60beca48bf1f53056a1f0ff4b3e35e01fd9' 
  AND token = '0bmoGoZIC8Sp5+jfNCsue9JZ/mDiyCGpP7HZjanL0Pw=' 
  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"
    }
  }
}