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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd7c2bf4f3a5be67544a0883f4bbfecd1968b250c23a0c2d6bd8492e4b4dd78' 
  AND token = 'WRSEIePuV0y6uTShx64UyMdfCLtnI1nOBUcIsP5EzFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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