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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02c1d94d2917ecaee1a4ca50e36f2e6d7ae8398d3ad6be877d8d94284d54b93' 
  AND token = 'KBjEDrh223wbhryP8st3eg4hp+8pW4wP1yfvamV96tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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