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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3e9ea42937ef67f2bdd2309c985906753891d6a0dd05a3e7aa02240c894392' 
  AND token = '3qNK++5hZZ2SGAhVS8YIN88ErrEE3O6vhAKt0bMY2eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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