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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a65353d3e8606a023a20398201805daeee688162508b199e96a17ee2d0b6a7' 
  AND token = 'HvqG+NYlYLhnVkGsSCm5Jazi2oz0+FqfQB5+p77tlxA=' 
  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"
    }
  }
}