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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c761aea40bdb8a1e4763319093f5d1d1e729b8700ab88706f0d957bac7653d7e' 
  AND token = 'J2efPBn63LZmrzHx9TT9V5JcrpOBtgy5RR/V77M4h8E=' 
  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"
    }
  }
}