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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13402fb9cc1a28f9562ee89a31478204ff9677f425bf03d7c29680fc9e9b8880' 
  AND token = 'nUhdSlfTH+kjYXh8rr08vEoLFuJbpkSc3+9JnbbZsgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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