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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fdddb1f21649a0e2912a3e2b80ed019cc3c5730e1049b0cf54862005587196' 
  AND token = 'PF03E4uUUQHLMVTFwFwdp49TWUfgj2kS64yMrAs1lF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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