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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a7c0989e9640f09b633031fa4da97f86a5ad48c2ddbd16694c2d4cacfa51e0' 
  AND token = 'spGNfJ3wO4UPvGXU16JP62y9K58C3GIQwysKsG8Ne8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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