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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29b873f825cf4802c76d721b3e871c49681d65b05eaf4b7c5cd9dfe332a0067' 
  AND token = 'JGNJbdap2J/35f9IDk+KotW0XDC+d0fVwjYFbHMCFHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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