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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae11e438b38dc2143fa24875134cf905e1bb5f7989af0434f2bc7db979b2187' 
  AND token = 'pQHMdEg57SUt4dH0A2P/wJjvK1zZmlWC/ptNVQ4mslc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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