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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c303d0e869e6354ad61f0dcf02d5561d29b9a309cdb60103f4912f39d2528c2' 
  AND token = 'RSjIpx3GCXQOEYGGp8W1r2pupQumVcE67W2ZooORdcE=' 
  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"
    }
  }
}